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<li><strong>Use <codeclass="python hljs"><spanclass="hljs-string">r'\1'</span></code> or <codeclass="python hljs"><spanclass="hljs-string">'\\1'</span></code> for backreference.</strong></li>
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<li><strong>Add <codeclass="python hljs"><spanclass="hljs-string">'?'</span></code> after an operator to make it non-greedy.</strong></li>
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